[Released] PyUSB 1.0.0 alpha 3

Dear all,

New PyUSB alpha release is out.

What's new in PyUSB 1.0.0 (alpha 3)?

**WARNING**: this release renames the libusb 1.0 and libusb 0.1 backends. If
your code makes direct access to this backends, you will have to change it.

- Fixed several legacy module bugs (by Tormod Volden).
- Fixed libusb0 backend for BSDs and Mac OSX.
- Fixed data loss when less the requested number of bytes were read (by
Braiden Kindt).
- Documentation fixes.